For titration of strong base with strong acid $\mathrm{p}\mathrm{H}$ changes sharply near equivalence point and at equivalent point $\mathrm{p}\mathrm{H}$ sharply decreases because strong base & strong acid dissociate completely.
$\stackrel{\mathrm{S}\mathrm{A}}{\mathrm{H}\mathrm{C}\mathrm{l}}+\stackrel{\mathrm{S}\mathrm{B}}{\mathrm{N}\mathrm{a}\mathrm{O}\mathrm{H}}\to \mathrm{N}\mathrm{aCl}+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$
at equivalent point $\mathrm{p}\mathrm{H}=7$ and at endpoint solution will be neutral.